Hi Jouni,
Wanted to ask if you've had the time look at this. The fix is patch 5/5,
the others are there only to reproduce the error with hwsim tests. If it
helps I can resend the patches with git send-mail.
Regards
Mikael Kanstrup
On 07/01/2016 10:36 AM, Mikael Kanstrup wrote:
Hi Jouni and all,
On Android M we've seen cases where Android's way of roaming sometimes
end up blacklisting incorrect bss.
Connected to BSSID1 to roam to another AP the following sequence of
commands are used:
SET_NETWORK 0 bssid <BSSID2>
ENABLE_NETWORK 0
REASSOCIATE
Most of the time this works just fine, though if authentication timer
times out (probably due to auth/assoc/eapol packet loss) the BSSID
roamed away from gets blacklisted (BSSID1), not the one failing to
reassociate with (BSSID2).
Interesting lines from the log look like this:
wlan0: Considering connect request: reassociate: 1 selected:
<BSSID2> bssid: <BBSID1> pending: 00:00:00:00:00:00 wpa_state:
COMPLETED ssid=<SSID> current_ssid=<SSID>
wlan0: Request association with <BSSID2>
wlan0: Re-association to the same ESS
...
wlan0: Add radio work 'connect'@0x7f9769c230
wlan0: First radio work item in the queue - schedule start immediately
wlan0: Starting radio work 'connect'@0x7f9769c230 after 0.000144
second wait
wlan0: Trying to associate with SSID <SSID>
...
wlan0: State: COMPLETED -> ASSOCIATING
...
Limit connection to BSSID <BBSID2> freq=5180 MHz based on scan results
(bssid_set=1)
...
nl80211: Connect (ifindex=6)
* bssid=<BSSID2>
* bssid_hint=<BSSID2>
...
nl80211: Connect request send successfully
wlan0: Setting authentication timeout: 10 sec 0 usec
...
wlan0: Authentication with <BSSID1> timed out.
Added BSSID <BSSID1> into blacklist
TDLS: Remove peers on disassociation
wlan0: WPA: Clear old PMK and PTK
wlan0: Request to deauthenticate - bssid=<BSSID1>
pending_bssid=00:00:00:00:00:00 reason=3 state=ASSOCIATING
Question is, is this way of using the REASSOCIATE command to perform
roam operation valid?
I worked on a patch that solved this specific case but had to apply
some hacks to reproduce it with hwsim tests. It would be great with
some feedback on the scenario and attached patches. I think not all of
them should really be applied but should help discussing the problem
seen.
Thanks
Mikael Kanstrup
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